nah, to get an opaque white you'd need to use paint, not dye, which would add detectable thickness. whiteness in paint comes from (transparent!) particles that stick to the surface. it's like snow at a tiny scale.

This is also true for artificial paints and pigments, where white results when finely divided transparent material of a high refractive index is suspended in a contrasting binder. Typically paints contain calcium carbonate and/or synthetic rutile with no other pigments if a white color is desired.

Damn. No hope on getting a good multicolor on champ or z plastic.
On another note. How badly would a few lines and dots of white paint effect a discs flight? And what would be the best method for getting it to stay?

They do make transparent Champion plastic discs.
"Ice" discs I've heard them called.
They're hard to find as most of em get the factory dye treatment .
But every now and then they'll just stamp em and send them off to retailers.
Ask around the online dealers, you'll eventually find some.

Easy to multi color with those without having to worry about color blending.

Here's what I did with the one I found
Dyed it blue with the snowflake pattern on it.
Was raffled off at an Ice Bowl.

JohnnyB wrote: but I also like to do faces in my dye's so if you do the multicolor and the eyes aren't white it doesn't look right.

If the eyes accidentally came out red it would look just fine for some people's portaits

How's this for lightening the color of a disc? This started out as, and continues to be, a blue champ beast. Notice that it isn't a trick of white backlighting or anything silly like that.

I guess it is as trick of contrast, though. I just masked off Bender and dyed the rest of the disc a little more blue, thereby making his body appear to have lightened. Even when you hold the disc in your hand and inspect it, Bender looks white. And he can't jump.

We are not like those other golfers. We throw our clubs and keep our balls where they belong. -Ol' Bob

A) Bender keeps me watching Futurama, as does Roger on American Dad. The Bender and Roger Show would own my TV.

B) A lot of the plastic dyes (factory stock plastic color) will bleach out in sunlight -- so it stands to reason that a masked Champ disc in the sun for a few days would lighten from its base color. purple seems to be the most bleachinest color (for innova)... they'll go clear eventualy.